Method of evaporation



oct. 2o, 1925. 1,558,022

A. W. LISSAUER- METHOD OF EVAPORATION Filed July 29J 1924 ATTORNEY Y titi Patented Oct. 20, 1925.

UNITED STATES PATENT OFFICE.

ADOLPE W. LISSUER, OF LOUISVILLE, KENTUCKY, AS'SIGNOR T0 LOUISVILLE ORYING MACHINERY CO. INC., OF LOUISVILLE,.KENTUCKY, A CORPORATION OF KENTUCKY.

METHOD F EVAPORLATION.

i Application filed July 29,1924. serial no. 728,849.

yson, :1nd State ofl Kentucky, have invented fa new Method of Evaporation, of which the following is a full, clear, and exact description.

The invention relates to a method for evaporation, particularly suitable for ltrates of distillers slop, or the liquor from the sulphite process in paper-making. The method has for its object a more economical vvay of evaporation. It utilizes the Waste Y Hue gases obtained from direct evaporation of the liquor or the iue gases available from any other furnaces.

A distinct feature of this method is that the flue gases act'upon a spray of liquor in the absence of the vapor .resulting from direct evaporation of the liquor. Y

Another object of theinvention is to provide a method which can be carried out with an equipment of loW cost and upkeep.

llhe appended drawing illustrates a form of apparatus suitable for my method of evaporation and in Which- Figure 1 is a vertical section on line 1-1, Figure 2, and l Figure 2 is a longitudinal section on line 2--2, Figure 1.

Referring to the drawing, 3 is the direct. red evaporator for heating of the raw liquor and Where the greater part ofevaporation is done. This direct-fired evaporator is in effect nothing but a horizontal tubularv fire tube boiler, in which the level of the liquor is kept just above the' top row of tubes by a suitable float 4 that controls the inflow of the liquor from the tube 5. The boiler isset in brick Work 6 and the flue gases from the burning of the fuel in the furnace 7 pass around the shell, then through the tubes 8 into the front housing 9 of the boiler.

'lhe flue gases are drawn from the front housing 9 by'a fan 10 which forces the flue gases through a spray evaporator 11. The fan 10 will be of the cinder-separatmg type when dry fuel is used for direct evapora@ ftion, by which I mean evaporatlon pro.

duced bythe heat of combustion.

rllhe spray evaporator has a plurality of rotary discs 12 against which the li uor is forced Athrough nozzles 13 to Wliic the eliminators 15 near the flue gases outlet 16.`

The said eliminators lcause the flue gases passing to the outlet 16 to deposit Whatever dust there is in them on the eliminators and from which the dust is Washed downby the liquor which is also deposited by the outgoing lue gases.

Thesump in the spray evaporator is divided into tvvo parts, 17 and 18, by a partition 19 located in proximity of the eliminators. This partition 19 has a wier which permits the overflow from compartment 17 to compartment 18. |The spray nozzles 13 are located over the compartment 18 While the eliminators are' located above the compartment 17. lThe sediment Which is Washed off theeliminatorsdeposits in compartment 17 and is drawn od intermittently through a pipe 20. rl`he said compartment 17,has also a draw-oft' pipe 21 for concentrated liquor. The liquor in the compartment 18 overflows through a pipev 22 into the boiler 3, so that the pump 14.- continuously circulates the liquor that is being concentrated.

To prevent loss by rad1ationthe spray evaporator 11 is surrounded b a jacket 23 which has a vapor stack 24 orming an outlet for the vapor, which is supplied to the jacket from the boiler 3 through a series of outlets 25. Through these outlets the overflow pipes enter the boiler.

, culatiug pump Will simply draw the liquor to be sprayed into a current of the Hue gases from the sump. ln such case it is self evident that the greater part of the .concentration has been done previously to the introduction of the liquor to the sump of the spray evaporator.

*From the above description of my method it Will be seen that where the dus gases come in contact vvith'the spray evaporator, no vapors are present from direct evaporaeva Mtl

tion of the liquor, thereby l. am able to utilize the heat of the flue gases to' its full extent, for the purposevo evaporation or concentration.

I Claim:

1 In' a method of evaporation orl c0ncentration, stepsj which consist in bringing liquor into heat exchange Withv products'ofv combustion, and atomizng the said liquor into a current of flue gases free of vapors from said liquor. Y

.2. V.ln a method of evaporation. or con-v centration, steps which consist in bringing a liquor into heat exchange with. products of combustion, forming a current of flue gases free of vapors from said liquor, spraying into the said current said liquor, and .jacketin spray with vapors from the liquor.

said current of flue gases V`and 3. ln .a method of evaporation or concentratlon, Steps Whlch conslst 1n brmgmg of combustion so that the products of evaporation from the liquor do not mix with the products of combustion, forming a current of flue gases resulting from combustion and free of vapors fromthe liquor, and spray ing into the said. current of flue gases the said liquor.

4. In a method of evaporation or concentration, steps whi'chconsst in atomizing a liquor into a current of flue gases free of vapor from said liquor and While said liquor is in heat exchange with products of combustion from which the flue gases are derived. q

\ ADoLrH W. LISSAUER.

'a liquor into heat exchange with products 

